Monday
July 28, 2014

Homework Help: AP CHEM

Posted by shylo on Thursday, July 31, 2008 at 10:31am.

Please help me with these AP Chemistry homework problems and show me the steps how to find the solutions:

Liquid-Liquid Tirations: What is the concentration of the unkown solution for each of the following titrations?

#5) 25.36 mL of 0.178 M NaOH is required to titrate an 25.00 Ml of an unknown concentration HF acid solution?
NaOH(aq) + HF(aq)--> NaF (aq) + H2O(l)


#14) 45.32 mL of 0.0200 M KMnO4 is required for complete titration of an 7.00 ml sample of decomposed blood. What is the molarity of iron in the blood sample? (Note: The blood sample is treated to destroy the hemoglobin and then to reduce iron to iron (II) ion. These steps have no affect on your calculations.)
8H+(aq) + 5Fe2+(aq) +MnO4- --> 5Fe3+(aq) + Mn2+(aq) + 4H2)(l)


#19) 34.09 mL of 0.251 M KOH is required to titrate a 10.2951 g sample of acetic acid. The density of the solution had been prevously found to be 1.007 g/mL. What is the molarity of the acetic acid solution?
KOH(aq) + HC2H3O2(aq) --> KC2H3O2 (aq) + 2H2O(l)

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